Nonfouling drill



NONFOULING DRILL 2 Shets-Sheet 1 Filed Jan. 28, 193'? [nugnfor Wade Vmz d67/700Z,

Dec. 7, 1937. w. VANDERPOOL 2,101,566

NONFOULING DRILL Fiied Jan. 28, 1937 v 2 Sheets-Sheet 2 Inventor fi ade %i7zde77wal Aiiorneg s Patented Dec. 7, 1937 Y NONFOULING DRILL V wadevanderpool, Stevenson, Wash.,' assignor of, one-halftoDee Wakefield, Stevenson; Wash.

Application; January 28, 1937, SerialNo. 122,863 :7 Claims. ((11. 255 -69) This invention relates to rockdrills and is particularly. adapted f0r.:u'se on jack hammers wherein a fluid operated motor on the hammer impartsv poweri pulsations to the drill and at the same timeflthe'drill rotates in a counter" clockwise direction relativeto the top of the drill under the' influence'of thecuttingaction. The present invention is a continuation in part of my pending U. SJPatent' application Serial 82,092 filed May 27, 1936. The primary object of theinvention is to pro- Vide; either as an integral or a separate part, the

lower end of the drillrod'with fins or blades arranged in a spiral, the said fins or blades having extension wings projecting below the connection of the end of the drill rod and bit, and which wings snugly fit'over the part or parts on the drill bitwherefouling is likely to occur. Another feature of the present invention is to construct the blades or'finsin a manner to grind or crush any obstacles'in the drill holes immediately above the drill bit cutting edge so that the crushed or ground obstacles maybe blown 'out offithe hole with .air; and which blades .or fins force the cuttings downward at the. same 'time thedrill and bit areforcedupward in event the drill isfouledinlthe drillfhole all of which is performed without interfering with the efficient operation ofthedrill.

Further objects of.;the invention are to providea device of the character referred to that is strong, compact, durable, thoroughly reliable for its intended purpose, very simple to manip- 535 ulate and. comparatively inexpensive to manue4 be hereinafter, more specifically described and illustrated in the accompanying drawings wherein is disclosed. anzembodiment of the invention, but it is to. be understood that changes, variations, and modifications maybe resorted to without departing fromthespirit of the claims hereunto appended. 1 I

In the drawings wherein like reference characters indicate like parts through the several .views:'-

Figure 1' is an exploded perspective view of the lower end of a rock drill of customary construc- 'tion to'which'the present invention may be attached when it is'made in a separate part.

Figure. 2 is a sideielevation partly broken away of one form of the presentinvention embodied in a separate part;and assembled with the customary drill ro'dand bit.

Figure 3 is a bottom plan view of either form of the drill constructed in accordance with the present invention.

Figure 4.is a side elevation partly broken away of a modified form of a drill embodying as an integral part of, the'lower end of the drill rod,

the construction of the presentinvention.

Figures 5 and :6 are sections taken substantially on the planes of lines 55 and6.6 of Figure 4 respectively and lookingin the direction of the arrows. r 1

i In the drawingsA indicatesthe lower end of -a conventional rock drill formed with a reduced threaded pin 8 on its'inner end. "This drill rod has an axial air passage l-therein through which air is forced :from the. surface of the ground downwardly into the hole for blowing out the cuttings. A regulation 'rock drill bit indicated B; is' detachable from:the drill rodA when the cutting edge wearsso that. another bit may be substituted. The outer end of the. drill rod A'is coupled to the jack hammer (not shown) from which the'drill rod receives power pulsations to drill the hole in the rock. As is well known in rock drilling practice that the drill consisting of the coupled drill rod A and the bit B turns slowly in a counter clockwise direction viewing the top of the drill, which rotation is independent of. the power impact pulsations. In this specification it is to be understood that the drill rod rotates in a counter clockwise direction looking atthe top ofthe drill rod. The same conventional drill bit is 'used regardless of whether the invention is embodied as an integral part of the drill rod'as shown in Figure 4 or as a separate part as shown in Figure 1.

'The regulation. drill bit B has a central cylindrical hub 9. For illustration the drill bit se lected is of a type having a single angular cutting edge or point ID as distinguished from those .types' of multiple radial points or cutting edges known as Star or Rose bits, and there are oppositely and radially disposed reinforcing ribs H, l.2of right triangular'configuration formed integral with the'hub 9. These ribs are not as 'thick as the diameter of the hub 9 and they terminate at their bases in line with the inner end of the hub 9 to form the single edge I0 across corresponding bases of the triangular ribs and.

the end of the hub. Corresponding altitudinal sides of the triangular ribs 1 l and I2 merge with the periphery of the hub 9 in an axial direction,

but they do not extend to the top of the hub 9,

and this formation leaves a circular shoulder 9a surrounding the upper end of the hub 9 above the juncture of like sides of the triangular ribs corresponding to the hypotenuse. It has been my experience that the cuttings, mud and other obstacles jam or wedge at this shoulder 9a and foul the drill. The wings or extensions of my invention prevent this fouling by grinding, cutting or pushing the material downwardly away from this shoulder where they may be blown out of the hole.

There is a threaded socket [3 in the upper or outer end of the hub 9 and there is an air duct I4 extending from the inner wall of the socket that has an outlet on a fiat diagonal segment [5 on the periphery of the hub 9 at the inner end of the hub. As is the practice in rock drilling, air is introduced through passage I to this duct M to blow cuttings, dirt and mud free of the cutting edge I ll and out of the hole.

The principle of the invention is the same regardless of whether it is applied as an integral part at the inner end of the drill rod, as illustrated in Figure 4, or as a detachable part as shown in Figure 2. In both cases, the regulation bit B as heretofore described is used. The only difference in construction is that where the conventional drill rod A has the shank l6 as a continuation at the inner end of the drill rod as shown in Figure 4 it will have a reduced threaded pin 8a detachably seated directly in the socket l3 of the bit B; whereas in the modified form shown in Figure 2 where the part is separate, the shank l5 has a threaded socket I! at the upper or outer end which receives the threaded pin 8 on the conventional drill rod A. Where the invention is embodied as a separate part it has a'reduced threaded end 8b on the lower or inner end of shank l6 which screws into socket l3 in the conventional bit B.

In either form of the invention the shank I6 is an elongated cylindrical body formed with an axial air passage I8. This passage l8 registers with passage 1 at one end and the duct M at the other end where the invention is embodied as a separate part as shown in Figure 2; while it is a continuation of the air passage of the drill rod on which it is formed where the invention is incorporated as an integral part as shown in Figure 4.

Formed on the periphery of the shank l 6 are a pair of oppositely disposed spirally arranged outset blades or fins I9-l9 which retreat one half turn or from the outer or upper end to the inner or lower end when the shank rotates in a counter clockwise direction. The fins or blades are continuous throughout the length of the shank. The inner or lower ends of the ribs continue below the end of shank I6 to form extension wings l9a,l9a. which overhang and overlap the shoulder 9a and the upper or outer portion of the sides of the triangular ribs corresponding to the hypotenuse.

The leading faces l9b-l9b of the fins |9l9 and wings |9al9a are fiat, while the trailing faces l9c-I9c are curved on substantially the same radius of the shank It. At the outer or upper end the fins merge with the periphery of the shank from which point they progressively increase in height in a radial direction relative to the shank, to the ends of the extensions or wings l9al9a. The confronting edges of the wings l9al9a. form an obtuse angle having corresponding edges 20 snugly yet movably fitting flush against shoulder 90 and the corresponding edges 2| fitting flush against the sides of the ribs corresponding to the hypotenuse so as to permit replacement of the bit B.

The fiat leading faces IEIb on the wings l9a are flush with the leading sides of the triangular ribs when the drill bit B is screwed home. Where the flat face I9b of the fin merges with the curved face We there is a sharp edge which acts as a spiral inclined cam that raises the drill free when it becomes fouled and this edge is also sharp enough to grind and reduce in size, any large cuttings that are too large to be blown out of the drill hole. It is also pointed out that the distance between the sharp edges on the fins is less than the width of the cutting point ID to provide clearance. Between the curved trailing face of the one fin and the fiat leading face 1% on the other fin there are spiral sumps or canal one opposite the other, where the cuttings, by reason of the counter pitch or retreat curvature of the fins are normally forced inwardly or downwardly by the counter clockwise rotation of the drill.

Having thus described my invention, what is claimed is:

1. In combination, a drill rod, a drill bit, coacting means on the rod and bit for detachably coupling them together, said drill rod carrying spiral fins formed with wings which overlap a portion of the drill bit when the rod and bit grtecoupled together to prevent fouling of the 2. In combination, a drill'rod, a drill bit, a member detachably connected to the rod and bit and formed with spiral fins and said fins having depending wings at one end overlapping a portion of the drill bit to prevent fouling of the 3. In combination, a drill rod, a drill bit detachably connected to one end of the drill rod, said drill rod formed with integral spiral fins on a portion at the said one end, and said fins terminating in depending wings overlapping a confronting portion of the drill bit to prevent the fouling of the bit.

4. In a drill of the jack hammer type, the combination with a drill rod and a detachable bit of spiral fins carried by a portion of the rod having wing, extensions on the fins overlapping a confronting portion of the bit to prevent fouling of the bit usually caused by the shoulder struc ture of the conventional jack hammer drill bit.

5. In a drill of the jack hammer type, the combination with a drill rod and a detachable bit of spiral fins carried by a portion of the rod having wing extensions on the fins overlapping a confronting portion of the bit to prevent filing of the bit usually caused by the shoulder structure of the conventional jack hammer drill bit, said fins being spiraled in a direction counter to the direction of rotation of the bit to direct downwardly the cuttings that otherwise tend to foul the bit.

6. In a drill of the jack hammer type, the combination with a drill rod and a bit, of a member adapted to be interposed between one end of the rod and the bit and serving to connect the bit to the rod, said member including a substantially cylindrical body having spiral fins thereon, said fins having end portions terminating beyond the lower end of said body and disposed at opposite sides of and in edge contact with said bit to prevent fouling of the bit usually caused by the shoulder structure of the conventional jack hammer drill bit.

7. In a drill of the jack hammer type, the combination with a drill rod and a bit, of a member the shoulder structure of the conventional jack hammer drill bit, said fins being spiralled in a direction counter to the direction of rotation of the bit and serving to direct downwardly wet or heavy cuttings that otherwise tend to foul the 5 bit.

WADE VANDERPOOL. 

